"Core gamers are buying it right now, people who want to get basically everything on the first day," said Mori.

"But there was not enough software to attract the main users, who are children."

Nintendo said it plans to release more kiddie-friendly titles for the GameCube including the eagerly-anticipated "Pikmin" and "Super Smash Brothers Melee," the sequel to the hit title that sold more than 5 million units worldwide.

The game company will unveil the game console to the U.S. market November 18.

However, due to last week's terrorist attacks that have shaken consumer sentiment, U.S. demand for game consoles could prove weaker than anticipated.

Nintendo nevertheless expects to ship 1.1 million GameCube units this year in the U.S., including 700,000 at launch.